Reddit reviews Sodium percarbonate (oxygen-based bleaching agent) 1kg
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Japan Household Cleaning Supplies - Over sodium carbonate (oxygen-based bleaching agent) 1kg *AF27*w/tracking number from JP Post
You can also find generic brand Oxyclean, it's generally labeled as "Oxygen Bleach". Which is sodium percarbonate.
*Something to keep in mind, Oxyclean is best used with HOT water.